ME 302 Midterm 1 - TEST 1 ME 302 WINTER 2OO7 t 8"4"h,f...

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TEST 1 ME 302 WINTER 2OO7 t. Considering the Brayton Cycle, contast the task of the turtine when used for could flow through the turbine and do wodg why is it dope (obviouslythe thermal efficiency increafslZ ,+t/ /f* ,,/- o, kf/'^ "4 "h,f Z/ *4- n t t',1 /,'?r'n [.J ,/A /* v""/"-( ,6 ry -A-*'l "#/' rd-* -/ \ 3. Considering the RankineCyclg while it is fire that superheating the steam in the boiler tends to provide a higher thermal effrciency, what is the main reason to use superheated steam? What process is used to insure tlat the steam to the turbine is zuperheated,while insuring a Egh pressure rat/o? )2,7,-.r- Z;; W*;If-'d\/-r,-1r'/"* fr"'h'+ I 'm;,- R.[*f rlroe+ \'//wvwq-\ u,twxav \ 4. The isentopic effrcieilcies forthe Brayton Cycle components have much more .i', meaning than those for the Rankine Cycle components. Why is this? -.L lr;-,^ /1" .,^fj ,4 ,"U Lartttt' Ni- 't- ( t,*,ril Llt* ; -- u*t ?1 8\
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5_ Refrigerant -LS4aenter$ the compressor of a refrigerator as superheated v$por at 0.1a Mpa_qnj=1-83er.ar&e of 0.05 kg/sand leaves at 0.8 Mpa and 50'C.
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